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The Hydrogen Epoch of Reionization Array (HERA) is a new powerfulradio-telescope, dedicated to the study of the early universe. Its main goal isto characterise the period of the universe where the first galaxies and starsstarted to form, by studying the evolution of the 21-cm emission signal fromneutral hydrogen, during the Epoch of Reionization. In this article, we presentan electromagnetic and electrical co-simulation of the antenna performed withCST. We focus our analysis on the characterisation of the chromatic effectscaused by the antenna, in particular multiple reflections of the receivedsignal between the feed and the dish. These reflections can have an importantimpact on the scientific results, and it is crucial to keep them as low aspossible. Therefore, we are currently developing a matching circuit which aimsto improve the impedance matching between the feed and the front end.

The Hydrogen Epoch of Reionization Array (HERA). Improvement of the antenna response with a matching network and scientific impacts